After finding two stripped lug bolts on the rear of my 4104 I was surprised to find out that they are not like truck lug bolts.

These bolts are serrated and tapered like others but are held in the hub by nuts instead of having heads like most lug bolts??

I had always assumed new ones could be found at any heavy vehicle parts store. Not so, my local guy can't even get them.

Luckily I found them at my closest bus parts guy. I have no idea if other buses have this type but it is a good idea to find out ahead of time.

For reference they are Euclid p/n E-5920 w/L or R at the end for the thread direction you want. These are the 3/4" rears and come in different lengths. Fronts are larger, I didn't get that number but I did order five extras for each wheel.

There's a page on my website that shows some do's and don't's on changing them.

Best is to take the hub off and check the bearings and replace the seals, if you haven't done that recently. It's easiest to get the studs out with the hub off, but not impossible todo it with the hub on. Disassemble the brakes and get them out of the way if you leave the hub on.

Basically, take the retaining nut off and drive the stud out of the hub with a large hammer. Put antiseize on the new stud and insert it in the hole. Then use a length of pipe about1" diameter to just fit over the stud and seat on the flange and drive the new stud into the hub. Install new crimp-lock retaining nut and torque to specs. Pretty simple. Do not poundon the stud end to insert it in the hub. That will compress the stud and swell it and your wheel nuts won't fit. Don't pull it in with the retaining nut. That could stretch the stud and fatigue it. They should be pressed in using the flange or on a large hydraulic press.

Replace them all! I know, it's not my money I'm spending...but since you are right there with the hub off anyway, these studs do get wear so just replace all 10 of them while you are there and you will probably never have another problem...especially with the age of GMs etc. Might as well replace the lug nuts too. Now granted, I sell parts, but also maintain a fleet of vehicles too.

That thought occurred to me but I only ordered 5, dumb! I found another marginal one today so I plan to use all five of them and order 5 more.

It would be nice if a re-threading tool existed for these bolts. A regular die is too large in diameter to do the job. Even a thread chaser would be nice but the bolt may be too hard for either. Or, the threads may be rolled for all I know!

My bet is they are better than grade 8. The nuts are grade 8, so I'd think if you followed the torque chart for grade 8, you'd be good. I may use loc-tite if there is one suitable for the temps that the hub will see from the brake drum . . .

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